Enable embenchen/copy for wasm.

This got fixed by this change:
    https://crrev.com/32a2ab0c724673961aa145ab63c79a29e6d28fa8

Adding a smaller mjsunit test capturing the issue (was with idiv register allocation).

BUG= https://bugs.chromium.org/p/chromium/issues/detail?id=593283
R=aseemgarg@chromium.org,titzer@chromium.org
LOG=N
TEST=asm-wasm-copy

Review URL: https://codereview.chromium.org/1820163002

Cr-Commit-Position: refs/heads/master@{#35041}

test/mjsunit/mjsunit.status

@@ -271,12 +271,12 @@
   'wasm/asm-wasm': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el]', SKIP]],
   # TODO(branelson): Figure out why ignition + asm-wasm-stdlib fails.
   'wasm/asm-wasm-stdlib': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el] or ignition == True', SKIP]],
+  'wasm/asm-wasm-copy': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el]', SKIP]],
 
   # TODO(branelson): Figure out why ignition + asm->wasm fails embenchen.
   'wasm/embenchen/*': [PASS, ['ignition == True', SKIP]],
 
   # TODO(bradnelson) Fix and re-enable.
-  'wasm/embenchen/copy': [FAIL],  # wrong answer
   'wasm/embenchen/box2d': [SKIP],   # hang
   'wasm/embenchen/lua_binarytrees': [SKIP],  # fails decode
   'wasm/embenchen/zlib': [SKIP],  # fails gc-stress

test/mjsunit/wasm/asm-wasm-copy.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-wasm
+
+(function TestCopyBug() {
+  // This was tickling a register allocation issue with
+  // idiv in embenchen/copy.
+  function asmModule(){
+    'use asm';
+    function func() {
+      var ret = 0;
+      var x = 1, y = 0, z = 0;
+      var a = 0, b = 0, c = 0, d = 0, e = 0, f = 0, g = 0;
+      do {
+        y = (x + 0) | 0;
+        z = (y | 0) % 2 | 0;
+        ret = (y + z + a + b + c + d + e + f + g) | 0;
+      } while(0);
+      return ret | 0;
+    }
+    return { func: func };
+  }
+  var wasm = Wasm.instantiateModuleFromAsm(asmModule.toString());
+  assertEquals(asmModule().func(), wasm.func());
+})();